Topic
Tetrahydrofuran
About: Tetrahydrofuran is a research topic. Over the lifetime, 11778 publications have been published within this topic receiving 158241 citations. The topic is also known as: diethylene oxide & 1,4-epoxybutane.
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TL;DR: In this paper, the reaction of alkynyllithium reagents with methyl dialkylborinates in tetrahydrofuran proceeds readily to form lithium methyl alkynyldialkylbiates.
41 citations
TL;DR: In this article, the synthesis of a tris(8-hydroxyquinoline)aluminum (AlQ3)-containing poly(arylene ether) (4) is reported, and the presence of AlQ3 pendants in polymer 4 is confirmed by NMR, ultraviolet-visible, photoluminescence and gel permeation chromatography analyses.
Abstract: In this article, the synthesis of a tris(8-hydroxyquinoline)aluminum (AlQ3)-containing poly(arylene ether) (4) is reported. The presence of AlQ3 pendants in polymer 4 is confirmed by NMR, ultraviolet–visible, photoluminescence, and gel permeation chromatography analyses. This is the first report of the attachment of AlQ3 complexes as side chains to a polymer. Polymer 4 has a glass-transition temperature of 217.8 °C and is thermally stable with a 5% weight-loss temperature greater than 500 °C under nitrogen, as determined by differential scanning calorimetry and thermogravimetric analyses, respectively. Polymer 4 is quite soluble in common organic solvents, such as tetrahydrofuran, N,N-dimethylacetamide, and CHCl3. A composite that is 80 wt % polymer 4 and 20 wt % AlQ3 forms a transparent and tough film when cast from its chloroform solution. The application of this AlQ3-containing polymer in light-emitting diodes is under investigation. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 2887–2892, 2000
41 citations
TL;DR: In this article, the first cycloheptatrienyl compound, tetrahydrofuran, has been determined and the reaction of the neutral compound has been analyzed.
Abstract: Reaction of UX
4
(X = NEt
2
or
BH
4
) with K[C
7
H
9
] afforded the anionic
complexes
K[X
3
U(µ-η
7
∶η
7
-C
7
H
7
)UX
3
] whereas treatment of
[Nd(BH
4
)
3
(thf)
2
]
(thf = tetrahydrofuran) with K[C
7
H
9
]
gave the neutral compound
[(thf)(BH
4
)
2
Nd(µ-η
7
∶η
7
-C
7
H
7
)Nd(BH
4
)(thf)
2
]. The formation of the
cycloheptatrienyl ligand resulted from the disproportionation reaction 3
C
7
H
9
-
→ C
7
H
7
3-
+ 2
C
7
H
10
. The crystal structure of
[(thf)(BH
4
)
2
Nd(µ-η
7
∶η
7
-C
7
H
7
)Nd(BH
4
)(thf)
3
], the first cycloheptatrienyl compound
of a 4f element, has been determined.
41 citations
TL;DR: In this paper, the authors compared the growth rates of tetrahydrofuran (THF) clathrate hydrate and ice using molecular dynamics simulations and showed that the growth rate of THF hydrate is much slower than that of ice.
Abstract: Tetrahydrofuran (THF) clathrate hydrate has been frequently used in experimental studies instead of gas hydrates because it forms at a temperature higher than the ice point under ambient pressure. In this paper, we compare the crystal growth rates of THF hydrate and ice using molecular dynamics simulations. It is demonstrated that the crystal growth of THF hydrate is much slower than that of ice. The growth rates of THF hydrate significantly deviate from a standard kinetic model known as the Wilson–Frenkel model, whereas it reproduces the temperature dependence of the growth rate of ice. The slow crystal growth and the deviation from the Wilson–Frenkel model are attributed to the trapping of THF molecules in open small cages at the hydrate surface. We calculate the free energy profile of a THF molecule transferring from the bulk solution phase to the hydrate surface using the umbrella sampling technique. It is shown that a THF molecule trapped in an open small cage needs to cross one or two free energy ba...
41 citations
TL;DR: The primary chemical equilibria which define autoprotolysis in aqueous binary solvents have been elucidated and the constants of these equilibrium values were computed in this paper.
Abstract: The primary chemical equilibria which define autoprotolysis in aqueous binary solvents have been elucidated and the constants of these equilibria computed for aqueous solvent mixtures of methanol, ethanol, 1-propanol, 2-propanol, 2-methyl-2-propanol, 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 1,2,3-propanetriol, acetonitrile, acetone, tetrahydrofuran, dimethyl sulfoxide, 1,4-dioxane, and formic acid. The values of these constants explain the different behaviors of the diverse binary solvents. From these fundamental constants, the plan value at any solvent composition of any of the binary solvents studied can be accurately computed
41 citations